Rogues are supposed to get the majority of their defense from not getting hit, in most games. Rogues would ideally just dodge and counter enough hits that they would heal more damage than they took, and since Rogues' primary stat is Nimbleness this would also scale; they'd recover less of their health, but they'd also be dodging more often and therefore would be taking fewer hits anyway. This would be especially irrelevant with the fixed-percentage HP idea I mentioned a few posts above, since Rogues would also be killing things really fast in melee. By the way, the "recover HP% on kill" would really only be justified for vampires if the kill was done to something next to you. Vampire mages would need all the magic power scaling they could get. Alternatively: Who takes primarily rogue skills into a dungeon?